/Engine/Source/Developer/DerivedDataCache/Public/DerivedDataCacheInterface.h
Retrieve usage stats by the DDC
void GatherUsageStats ( [TMap](API\Runtime\Core\Containers\TMap)< [FString](API\Runtime\Core\Containers\FString), [FDerivedDataCacheUsageStats](API\Developer\DerivedDataCache\FDerivedDataCacheUsageStats) > & UsageStats )